Thanks for your reply. You are right, that the SSD is not listed. As it works when hotplugging until next reboot though it should really work at all times.
Also I had already found that sense whitepaper. But the codes are decoded anyways in the log messages : either "power" or "no additional information", both of which are not really helpful.
And to stress again: none of these problems appear if I hotplug and create the volume, only after next reboot.